sbit Data    at RB0_bit;
sbit DataDir at TRISB0_bit;
unsigned short k;

unsigned short T_Byte1, T_Byte2, RH_Byte1, RH_Byte2;
char temp[] = "Temperature is 00.0 C";
char hum[] = "Humidity is 00.0 %";

void DHT11StartSignal(){
  DataDir = 0;
  Data    = 0;
  Delay_ms(25);
  Data    = 1;
  Delay_us(30);
  DataDir = 1;
}

unsigned short DHT11CheckResponse(){
  k = 150;
  while(!Data){
    Delay_us(2);
    k--;
    if(k<1) return 0;  // time out
  }
  k = 150;
  while(Data){
    Delay_us(2);
    k--;
    if(k<1) return 0;   // time out
  }
  return 1;
}


unsigned short DHT11ReadByte(){
  int i;
  unsigned short num = 0;
  DataDir = 1;
  for (i=0; i<8; i++){
    while(!Data);
    Delay_us(40);
    if(Data) num |= 1<<(7-i);
    while(Data);
  }
  return num;
}

void main() {
  UART1_Init(9600);
  TRISC.RC0 = 0;
  TRISC.RC1 = 0;
  TRISC.RC2 = 0;

  while(1){
    DHT11StartSignal();
    if(!DHT11CheckResponse()) continue;
    RH_Byte1 = DHT11ReadByte();
    RH_Byte2 = DHT11ReadByte();
    T_Byte1 = DHT11ReadByte();
    T_Byte2 = DHT11ReadByte();
    DHT11ReadByte(); /* Checksum */

    // Set temp
    temp[15] = T_Byte1/10 + 48;
    temp[16] = T_Byte1%10 + 48;
    temp[18] = T_Byte2/10 + 48;
    UART1_Write_Text(temp);
    UART1_Write(10);
    UART1_Write(13);

    // Set hum
    hum[12] = RH_Byte1/10 + 48;
    hum[13] = RH_Byte1%10 + 48;
    hum[15] = RH_Byte2/10 + 48;
    UART1_Write_Text(hum);
    UART1_Write(10);
    UART1_Write(13);
    UART1_Write(10);
    UART1_Write(13);

    PORTC.RC0 = (RH_Byte1) >= 20;
    PORTC.RC1 = (RH_Byte1) >= 30;
    PORTC.RC2 = (RH_Byte1) >= 40;

    // Wait
    Delay_ms(1000);
  }
}